Can Christians and atheist explain this to me?

Because most of them choose to follow other gods, thus forgetting who the true God was.

Much like today, many don't even know God's name.

Their ancestors moved away, rebelled against God, and neglected His word. If one generation does not teach their children, then their descendants may need missionaries to come in and teach them the truth.

But all was not lost from their history. For example, in the Bible you can read about the great flood and you can read the account of the Tower of Babel.

Ancient tribes in the Americas also told such a story. Many of these stories are very close to these Genesis account.

The Aztecs tell of a worldwide global flood in a story with striking parallels to the biblical deluge. “Only two people, the hero Coxcox and his wife, survived the flood by floating in a boat that came to rest on a mountain” . Then, soon after the flood, giants constructed a great pyramid in an endeavor to reach the clouds. Such ambition is said to have angered the gods, who scattered the giants with fire sent from the heavens (cf. Genesis 11:1-9).

In the ancient land we now refer to as Mexico, one tribe of Indians, known as the Toltecs, told of a great flood. In their legend, a deluge destroyed the “first world” 1,716 years after it was created. Only a few people escaped this worldwide flood, and did so in a “toptlipetlocali” (a word that means “closed chest”). After these few people exited the closed chest, they wandered about the Earth, and found a place where they built a “zacuali” (a high tower) in case another flood came upon the Earth. At the time of the “zacuali,” the Toltecs’ languages were confused and they separated to different parts of the Earth.

Another ancient tribe of Mexico told the story of a man named Tezpi who escaped the deluge in a boat that was filled with animals. Similar to Noah, who sent out a raven (a scavenger bird) that never returned, and a dove that came back with an olive leaf, “Tezpi released a vulture, which stayed away, gorging on cadavers. Then he let a hummingbird go, and it returned to him bearing a twig”

The abrahamic god has been taken out of context. And an all-knowing god must understand that someone raised in a religion other than Christianity isn't going to convert, which is why even as a Christian, I don't believe that christianity is the only way to god. I think religions are all for us, and for people to feel comfortable. There is many ways to god. And I will never believe otherwise.

Because they needed to brainwash them as well so they could control the world and $.. The scare them into religion and then they would be good and they won't fight back because fighting is a sin and they were scared they were going to go to the mythical hell that doesn't really exist, but don't worry in the distant future there will be no such thing as religion and every one will be a deist ( I hope )

An all knowing God knows that this child born to Islamic parents will be brought up in the Islamic Faith. He also knows that this other child born to Christian parents will be brought up in the Christian Faith and that the two children will eventually fight.

Why did God do this?

The Disciples started preaching to the whole world.

There's no reasonable explanation for this phenomenon, since as far as we know today, the very premise of your question is flawed.

because they were smart enough no to believe in man made gods... Cherokee nation.. Mothers side..

Because the europeans were retarded.

because Christianity was a cultural phenomenon....